ABB Relion 630 Series, Technical Manual

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During the power-exporting condition, the available power and active power of the
power source can be configured using the
Power Cfg export Mod setting.
If the Power Cfg export Mod setting is “Pow & Ava Pow Zero” and active power value
is negative, the calculated available power and active power values are zero.
If the Power Cfg export Mod setting is “Pow & Ava Pow No Chg” and active power
value is negative, the calculated available power and active power values remain same
as the calculated values.
The calculated available power is reported to the Slow load shed logic module. The
calculated active power is reported to the Slow load shed logic, Demand based load
shed and Binary to integer modules.
PSCSWI can handle the generator source or external source by setting the values of
Source configure to “Generator” for the generator and “External source” for an
external source.
The governor mode of the generator is provided by
GOV_MODE
output. The
GOV_MODE
output is “Not applicable” for an external source.
If the Enable Comm Gov mode setting is “Enable” and the
AP_GOV_QVAL
input
is ”Good”, the
GOV_MODE
output is same as the
GOVERNOR_MOD
input.
If the Enable Comm Gov mode setting is “Disable” or the AP_GOV_QVAL input
is ”Bad” or the
GOVERNOR_MOD
input is invalid, the
GOV_MODE
output is same as
the Governor mode setting.
7.4.4.2 Block logic
This module calculates the load-shedding blocking status based on the circuit breaker
data quality, circuit breaker position or IED test mode of the power source.
If the input
CB_IED_QVAL
(power source IED data quality) is "Bad” at the
measurement cycle, the load-shedding blocking status is TRUE for the duration of the
CB_IED_QVAL
input being "Bad" and for additional t+T time as shown in Figure
132 .
If the input
CB_IED_QVAL
is "Bad” within a measurement cycle, the load-shedding
blocking status is TRUE for the duration of the
CB_IED_QVAL
input being "Bad" as
shown in Figure 133 . Once the CB_IED_QVAL input changes from "Bad" to "Good",
the load-shedding blocking status changes from TRUE to FALSE.
Section 7
1MRS757256 F
Power management functions
218 PML630/Compact Load-Shedding Solution
Technical Manual